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Created and illustrated By:
Angelo Romero and Camilo Sanabria
Simple and Compound Machines
A simple machine is a mechanical device that changes the direction or magnitude of a force. Simple machines do work with one single movement.
There are six simple machines that are the basis for all complex machines. These simple machines are the lever, the wheel and axle, the wedge, the pulley, the inclined plane, and the screw.
Compound machines are made up of two or more simple machines working together. The mechanical advantage is the amount of effort saved when using simple or complex machines.
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An example of a compound machine is a bicycle. Although it doesn’t seem like it, a bicycle is a rather complex compound machine. A bicycle uses screws, wheels, a wheel and axle system, pedals that turn a pulley, gear shifts, and brake handles that are levers.
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Although at first it may appear that simple and compound machines are unrelated to science, they are really made up of the many complex concepts and theories of physics. Physics is the science that deals with matter, energy, motion, and force.
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1. What is the writer’s main idea?
2. What example supports the writer’s main idea?
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3. How does the example help the writer’s argument?
4. What do you think about the story?
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